package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.Follow;
import com.hmdp.mapper.FollowMapper;
import com.hmdp.service.IFollowService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.UserHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class FollowServiceImpl extends ServiceImpl<FollowMapper, Follow> implements IFollowService {
    @Autowired
    private RedisTemplate redisTemplate;
    @Autowired
    private IUserService userService;
    @Override
    public Result follow(Long followUserId) {
        Long userId = UserHolder.getUser().getId();
        LambdaQueryWrapper<Follow> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(Follow::getFollowUserId, followUserId).eq(Follow::getUserId, userId);
        int count = super.count(queryWrapper);
        return Result.ok(count > 0);
    }

    @Override
    public Result isFollow(Long followUserId, Boolean isFollow) {
        Long userId = UserHolder.getUser().getId();
        String key = RedisConstants.FOLLOW_key + userId;
        if (isFollow) {
            Follow follow = new Follow();
            follow.setFollowUserId(followUserId);
            follow.setUserId(userId);
            boolean isSuccess = super.save(follow);
            if (isSuccess) {
                redisTemplate.opsForSet().add(key, followUserId.toString());
            }
        } else {
            LambdaQueryWrapper<Follow> queryWrapper = new LambdaQueryWrapper<>();
            queryWrapper.eq(Follow::getFollowUserId, followUserId).eq(Follow::getUserId, userId);
            super.remove(queryWrapper);
            redisTemplate.opsForSet().remove(key, followUserId.toString());
        }
        return Result.ok("");
    }

    @Override
    public Result followCommons(Long id) {
        Long userId = UserHolder.getUser().getId();
        String key = RedisConstants.FOLLOW_key + userId;
        String key1 = RedisConstants.FOLLOW_key + id;
        Set<String> intersect = redisTemplate.opsForSet().intersect(key, key1);
        if(intersect==null || intersect.isEmpty()){
            return Result.ok(Collections.emptyList());
        }
        List<Long> ids = intersect.stream().map(Long::valueOf).collect(Collectors.toList());
        List<UserDTO> userDTOS = userService.listByIds(ids).stream().map(user -> BeanUtil.copyProperties(user, UserDTO.class))
                .collect(Collectors.toList());
        return Result.ok(userDTOS);
    }
}
